Better left to init system or desktop manager or hooks

Seems like it was never realized (saturnin-ln would always remove the
target first)

... as it's going away from Fastfoo pretty soon.

Too complicated and little useful

Preserve lowercase matching in query mode (not in bookmark mode).

Since `delim` is not empty by default, this also requires to change
logic for determinig if the split will be done--now it's true if any
of --split or --split-field have been provided.